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Science
Physics
General Relativity Physics Vocabulary
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Terms in this set (9)
correspondence principle
if a new theory is valid, it must correspond with the old theory in the region where they both apply
general theory of relativity
Einstein' s generalization of spacial relativity, where gravity causes space to become curved and time to slow down
geodesics
line of shortest distance between two points in a curved space
gravitational red shift
a slight decrease in the frequency of light due to the effects of strong gravitational fields, such as those of stars
gravitational wave
ripples that travel outwards from a source of gravity at the speed of light
principle of equivalence
local observation made in accelerated frame of reference cannot be distinguished from observations made in a Newtonian gravitational field
relativistic momentum
momentum at very high speeds approaching the speed of light
rest energy
the "energy of being" given the equation e=mc2
rest mass
the intrinsic mass of an object, a fixed property independent of speed and energy
Verified questions
physics
a. In your own words, define what a longitudinal wave is. b. Give an example of a wave that, from your own experience, you know is a longitudinal wave. What observations or evidence tells you this is a longitudinal wave?
physics
Two identical plane mirrors of width w are placed a distance d apart with their mirrored surfaces parallel and facing each other. (a) A beam of light is incident at one end of one mirror so that the light just strikes the far end of the other mirror after reflection. Will the angle of incidence be $(1)\ \sin ^{-1}(w / d),(2)\ \cos ^{-1}(w / d),$ or $(3)\ \tan ^{-1}(w / d) ?$ (b) If d = 50 cm and w = 25 cm, what is the angle of incidence?
physics
It’s a snowy day and you’re pulling a friend along a level road on a sled. You’ve both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. You’ve been walking at a steady 1.5 m / s, and the rope pulls up on the sled at a $30^{\circ}$ angle. You estimate that the mass of the sled, with your friend on it, is 60 kg and that you’re pulling with a force of 75 N. What answer will you give?
physics
A cube of water 10 cm on a side is placed in a microwave beam having $E_{0}=11 \mathrm{kV} / \mathrm{m}$. The microwaves illuminate one face of the cub e, a nd the water absorbs 80% of the incident energy. How long will it take to raise the water temperature by $50^{\circ} \mathrm{C}$? Assume that the water has no heat loss during this time.
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